Browse Titles - 3236 results
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Advanced Polymeric Biomaterials - An Integrated Solution for Plastic, Reconstructive and Aesthetic Surgery
(Switzerland: Trans Tech Publications, 2015), 10 page(s)
Biomaterials have upgraded the field of plastic surgery to an impressive level. In this article attention is focused on the biomaterials that have allowed major advances in plastic, reconstructive and aesthetic surgery and the possible future prospects in this field. Consequently, we highlight surgical application...
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(Switzerland: Trans Tech Publications, 2015), 10 page(s)
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Biomaterials have upgraded the field of plastic surgery to an impressive level. In this article attention is focused on the biomaterials that have allowed major advances in plastic, reconstructive and aesthetic surgery and the possible future prospects in this field. Consequently, we highlight surgical applications of polymer biomaterials like silicone, polymethylmethacrylate, polyester, nylon, polyethylene, polypropylene, cyanoacrylate and polyt...
Biomaterials have upgraded the field of plastic surgery to an impressive level. In this article attention is focused on the biomaterials that have allowed major advances in plastic, reconstructive and aesthetic surgery and the possible future prospects in this field. Consequently, we highlight surgical applications of polymer biomaterials like silicone, polymethylmethacrylate, polyester, nylon, polyethylene, polypropylene, cyanoacrylate and polytetrafluoroethylene, currently in use all over the world.
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Field of Study
Global Issues
Content Type
Periodical article
Date Published / Released
2015-03, 2015
Publisher
Trans Tech Publications
Topic / Theme
Engineering
Copyright Message
Copyright © 2015 Trans Tech Publications Ltd.
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Advanced Possibilities of Fast Quality Check in Wire Production Processes by Means of Fast Microstructure Analysis
(Switzerland: Trans Tech Publications, 2017), 10 page(s)
A new method for a fast analysis of heavily deformed, multicomponent ferritic/pearlitic steels microstructure based on XRD measurements had been developed. Its practical application has been examined and proven during wire rod production of a high-strength eutectoid non-alloyed steel grade containing 0.81 weight p...
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(Switzerland: Trans Tech Publications, 2017), 10 page(s)
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A new method for a fast analysis of heavily deformed, multicomponent ferritic/pearlitic steels microstructure based on XRD measurements had been developed. Its practical application has been examined and proven during wire rod production of a high-strength eutectoid non-alloyed steel grade containing 0.81 weight percent carbon. For individual technological conditions, the lattice strains and their anisotropy were analysed quantitatively by means...
A new method for a fast analysis of heavily deformed, multicomponent ferritic/pearlitic steels microstructure based on XRD measurements had been developed. Its practical application has been examined and proven during wire rod production of a high-strength eutectoid non-alloyed steel grade containing 0.81 weight percent carbon. For individual technological conditions, the lattice strains and their anisotropy were analysed quantitatively by means of fast X-ray diffraction measurements and correlated with the results of comprehensive mechanical testing. Obtained relationships between the microstructure characteristics and mechanical properties were described using physically based models and used to establish a material specific database for prediction of the mechanical properties from X-ray diffraction data. Depending on the deformation state different parameters have to be applied for the material's macroscopic properties prediction. Additionally, the fast microstructure analysis can provide more detailed information in the case of deviations from the as-required material's properties due to technological aberrations.
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Field of Study
Global Issues
Content Type
Periodical article
Date Published / Released
2017-03, 2017
Publisher
Trans Tech Publications
Topic / Theme
Engineering
Copyright Message
Copyright © 2017 Trans Tech Publications Ltd.
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Advances in Constitutive Modeling of Plasticity for Forming Applications
(Switzerland: Trans Tech Publications, 2016), 13 page(s)
A succinct description of advanced constitutive models for applications to forming process simulations is provided. These models are continuum-based because they are more efficient in terms of computation time than microstructure-based models. However, they are so-called advanced because they are considered in man...
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(Switzerland: Trans Tech Publications, 2016), 13 page(s)
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A succinct description of advanced constitutive models for applications to forming process simulations is provided. These models are continuum-based because they are more efficient in terms of computation time than microstructure-based models. However, they are so-called advanced because they are considered in many scientific studies but rather scarcely used in industrial applications. In addition, the relationship between these continuum constit...
A succinct description of advanced constitutive models for applications to forming process simulations is provided. These models are continuum-based because they are more efficient in terms of computation time than microstructure-based models. However, they are so-called advanced because they are considered in many scientific studies but rather scarcely used in industrial applications. In addition, the relationship between these continuum constitutive models and multi-scale approaches based on crystal plasticity, dislocation dynamics and mechanics of multi-phase materials, such as advanced high strength steels, is substantiated.
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Field of Study
Global Issues
Content Type
Periodical article
Date Published / Released
2016-02, 2016
Publisher
Trans Tech Publications
Topic / Theme
Engineering
Copyright Message
Copyright © 2016 Trans Tech Publications Ltd.
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Advances in Fast Epitaxial Growth of 4H-SiC and Defect Reduction
(Switzerland: Trans Tech Publications, 2016), 9 page(s)
This paper reports on recent advances in 4H-SiC epitaxial growth toward high-throughput production of high-quality and uniform 150 mm-diameter 4H-SiC epilayers by enhancing of growth rates, improving uniformity and reducing defect densities. A vertical single-wafer type SiC epitaxial reactor is employed and high-s...
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(Switzerland: Trans Tech Publications, 2016), 9 page(s)
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This paper reports on recent advances in 4H-SiC epitaxial growth toward high-throughput production of high-quality and uniform 150 mm-diameter 4H-SiC epilayers by enhancing of growth rates, improving uniformity and reducing defect densities. A vertical single-wafer type SiC epitaxial reactor is employed and high-speed wafer rotation is confirmed as effective, not only for enhancing growth rates without increasing the source gas supply but also im...
This paper reports on recent advances in 4H-SiC epitaxial growth toward high-throughput production of high-quality and uniform 150 mm-diameter 4H-SiC epilayers by enhancing of growth rates, improving uniformity and reducing defect densities. A vertical single-wafer type SiC epitaxial reactor is employed and high-speed wafer rotation is confirmed as effective, not only for enhancing growth rates without increasing the source gas supply but also improving thickness and doping uniformities. The current levels of reducing particle-induced defects, in-grown stacking faults, basal plane dislocations and the Z1/2 center (carbon vacancies) are reviewed.
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Field of Study
Global Issues
Content Type
Periodical article
Date Published / Released
2016-05, 2016
Publisher
Trans Tech Publications
Topic / Theme
Engineering
Copyright Message
Copyright © 2016 Trans Tech Publications Ltd.
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![Advances in Level-Set Modeling of Recrystallization at the Polycrystal Scale - Development of the Digi-[mu] Software](https://d3crmev290s45i.cloudfront.net/content/1009451xxx/1009451313/1009451313-size-exact-140x0.jpg "Advances in Level-Set Modeling of Recrystallization at the Polycrystal Scale - Development of the Digi-[mu] Software")
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Advances in Level-Set Modeling of Recrystallization at the Polycrystal Scale - Development of the Digi-[mu] Software
(Switzerland: Trans Tech Publications, 2015), 9 page(s)
The mechanical and thermal properties of metallic materials are strongly related to theirmicrostructure. An accurate and quantitative prediction of microstructural evolutions is then crucialwhen it comes to optimize the forming process. Recently a new full field approach, based on a Level-Set (LS) description of i...
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(Switzerland: Trans Tech Publications, 2015), 9 page(s)
Description
The mechanical and thermal properties of metallic materials are strongly related to theirmicrostructure. An accurate and quantitative prediction of microstructural evolutions is then crucialwhen it comes to optimize the forming process. Recently a new full field approach, based on a Level-Set (LS) description of interfaces in a finite element (FE) context has been introduced to model 2D and3D primary recrystallization (ReX), including the nucleat...
The mechanical and thermal properties of metallic materials are strongly related to theirmicrostructure. An accurate and quantitative prediction of microstructural evolutions is then crucialwhen it comes to optimize the forming process. Recently a new full field approach, based on a Level-Set (LS) description of interfaces in a finite element (FE) context has been introduced to model 2D and3D primary recrystallization (ReX), including the nucleation stage [1, 2], and has been extended to takeinto account the grain growth (GG) stage [3, 4]. The ability of this approach to model also the Zenerpinning (ZP) phenomenon without any assumption concerning the shape of second phase particleswas also demonstrated [5]. Moreover, recent developments have also illustrated the capability of thisapproach to take into account the characteristics of twin interfaces during grain boundary motion [6,7]. Current work concerns also the improvement of the numerical cost of this new approach [8]. Allthese developments are necessary to account for the microstructural complexity of ReX phenomenon.
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Field of Study
Global Issues
Content Type
Periodical article
Date Published / Released
2015-07, 2015
Publisher
Trans Tech Publications
Topic / Theme
Engineering
Copyright Message
Copyright © 2015 Trans Tech Publications Ltd.
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Advances in Superplasticity of Ultrafine-Grained Alloys: Recent Research and Development
(Switzerland: Trans Tech Publications, 2016), 14 page(s)
Recent studies have revealed that ultrafine-grained (UFG) metals and alloys produced by severe plastic deformation (SPD) can demonstrate extraordinary superplasticity at low temperatures and/or high strain rates. This work presents new results on superplasticity in several UFG Al and Ti alloys focusing on microstr...
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(Switzerland: Trans Tech Publications, 2016), 14 page(s)
Description
Recent studies have revealed that ultrafine-grained (UFG) metals and alloys produced by severe plastic deformation (SPD) can demonstrate extraordinary superplasticity at low temperatures and/or high strain rates. This work presents new results on superplasticity in several UFG Al and Ti alloys focusing on microstructural evolution and strain hardening, as well as the challenges of their application. Grain refinement in these alloys was accomplish...
Recent studies have revealed that ultrafine-grained (UFG) metals and alloys produced by severe plastic deformation (SPD) can demonstrate extraordinary superplasticity at low temperatures and/or high strain rates. This work presents new results on superplasticity in several UFG Al and Ti alloys focusing on microstructural evolution and strain hardening, as well as the challenges of their application. Grain refinement in these alloys was accomplished using severe plastic deformation techniques, including new modifications of equal channel angular pressing (ECAP). Unusual behavior of UFG alloys originates both from the formation of ultrafine grain by SPD processing as well as the state of grain boundaries in these materials. It is established that superplastic deformation allowed not only to attain their efficient forming, but also to improve the ultrafine-grained structure and to obtain enhanced mechanical properties in the articles produced. The results demonstrate the possibilities of new applications of superplastic forming using bulk nanostructured materials.
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Field of Study
Global Issues
Content Type
Periodical article
Date Published / Released
2016-01, 2016
Publisher
Trans Tech Publications
Topic / Theme
Engineering
Copyright Message
Copyright © 2016 Trans Tech Publications Ltd.
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The Aesthetics of Apartheid in Palestine
Article about the photographic collection "Keep Your Eye on the Wall: Palestinian Landscapes"
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Description
Article about the photographic collection "Keep Your Eye on the Wall: Palestinian Landscapes"
Field of Study
Global Issues
Content Type
Periodical article
Author / Creator
Andrew Ryder, fl. 2014, Warscapes
Date Published / Released
2014
Topic / Theme
Israeli-Palestinian Conflict (1948 -- ), Political boundaries, Photographs, Israeli-Palestinian Conflict, 1993-, Geography, Sociology, The Arts, International Response, Palestinians, Israelis, 20th Century in World History (1914--2000)
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Age-Dependent Lattice Discrete Particle Model for Quasi-Static Simulations
(Switzerland: Trans Tech Publications, 2016), 9 page(s)
For decades, concrete plays an important role worldwide as a structural material. Construction planning and reliability assessment require a thorough insight of the effects that determine concrete lifetime evolution. This study shows the experimental characterization as well as the results of subsequent aging simu...
Sample
(Switzerland: Trans Tech Publications, 2016), 9 page(s)
Description
For decades, concrete plays an important role worldwide as a structural material. Construction planning and reliability assessment require a thorough insight of the effects that determine concrete lifetime evolution. This study shows the experimental characterization as well as the results of subsequent aging simulations utilizing and coupling a Hygro-thermo-chemical (HTC) model and the Lattice Discrete Particle Model (LDPM) with aging effects fo...
For decades, concrete plays an important role worldwide as a structural material. Construction planning and reliability assessment require a thorough insight of the effects that determine concrete lifetime evolution. This study shows the experimental characterization as well as the results of subsequent aging simulations utilizing and coupling a Hygro-thermo-chemical (HTC) model and the Lattice Discrete Particle Model (LDPM) with aging effects for concretes at various early ages. The HTC component of the computational framework allows taking into account any form of environmental curing conditions as well as known material constituents and predicts the level of concrete maturity. Mechanical response and damage are captured by the well-established LDPM, which is formulated in the framework of discrete meso-scale constitutive models. The chemo-mechanical coupling is accomplished by a set of aging functions that link the meso-scale material properties to an effective aging degree, accounting for cement hydration, silica fume reaction, polymerization, and temperature effects. After introducing the formulations the framework is applied to experimental data of 3 standard low and higher strength concretes. Investigated tests include two types of unconfined compression, Brazilian splitting, three-point-bending, and wedge splitting. Following the model calibration the framework is validated by purely predictive simulations of structural level experimental data obtained at different ages for the same concretes.
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Field of Study
Global Issues
Content Type
Periodical article
Date Published / Released
2016-09, 2016
Publisher
Trans Tech Publications
Topic / Theme
Engineering
Copyright Message
Copyright © 2016 Trans Tech Publications Ltd.
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Age-Hardening Response of Mg-Al-Sn Alloys
(Switzerland: Trans Tech Publications, 2015), 9 page(s)
Precipitation hardening has been used before as one of the most effective strengthening methods for many metallic alloys. However, this method has not been studied completely in magnesium alloys, and the numbers of precipitation hardenable wrought Mg alloys are still very limited compared to aluminum alloys and st...
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(Switzerland: Trans Tech Publications, 2015), 9 page(s)
Description
Precipitation hardening has been used before as one of the most effective strengthening methods for many metallic alloys. However, this method has not been studied completely in magnesium alloys, and the numbers of precipitation hardenable wrought Mg alloys are still very limited compared to aluminum alloys and steels. The age hardening responses of Mg-Al-Sn alloys in cast-homogenized condition were investigated by isothermal aging at 200°C for...
Precipitation hardening has been used before as one of the most effective strengthening methods for many metallic alloys. However, this method has not been studied completely in magnesium alloys, and the numbers of precipitation hardenable wrought Mg alloys are still very limited compared to aluminum alloys and steels. The age hardening responses of Mg-Al-Sn alloys in cast-homogenized condition were investigated by isothermal aging at 200°C for prolonged time. It was found that hardness can be improved significantly for the alloy with higher amounts of tin. The improvement in hardness was reasoned by the formation of precipitates. The shapes and morphology of the precipitates were different depending on the orientations of the grains. The precipitates were characterized by scanning electron microscope.
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Field of Study
Global Issues
Content Type
Periodical article
Date Published / Released
2015-08, 2015
Publisher
Trans Tech Publications
Topic / Theme
Engineering
Copyright Message
Copyright © 2015 Trans Tech Publications Ltd.
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Ag-Enhanced Antibacterial Property of MgO Film
(Switzerland: Trans Tech Publications, 2016), 9 page(s)
MgO and silver-containing MgO (AgMgO, 3.3, 9.1 at% Ag) films were sol-gel coated on titanium to improve its antibacterial property. Thermal analyses of MgAc2 4H2O powder revealed that MgO was crystallized at 400 °C. X-ray diffraction analysis showed that MgO was converted to Mg(OH)2 or Mg5(CO3)4(OH)2 4H2O during...
Sample
(Switzerland: Trans Tech Publications, 2016), 9 page(s)
Description
MgO and silver-containing MgO (AgMgO, 3.3, 9.1 at% Ag) films were sol-gel coated on titanium to improve its antibacterial property. Thermal analyses of MgAc2 4H2O powder revealed that MgO was crystallized at 400 °C. X-ray diffraction analysis showed that MgO was converted to Mg(OH)2 or Mg5(CO3)4(OH)2 4H2O during the ageing in air. Silver nanoparticles at the surface of AgMgO films were identified by scanning electron microscopy and x-ray photoel...
MgO and silver-containing MgO (AgMgO, 3.3, 9.1 at% Ag) films were sol-gel coated on titanium to improve its antibacterial property. Thermal analyses of MgAc2 4H2O powder revealed that MgO was crystallized at 400 °C. X-ray diffraction analysis showed that MgO was converted to Mg(OH)2 or Mg5(CO3)4(OH)2 4H2O during the ageing in air. Silver nanoparticles at the surface of AgMgO films were identified by scanning electron microscopy and x-ray photoelectron spectroscopy. The MgO film was about 1.5 um thick. The potentiodynamic polarization test in the Ca-free Hank's balanced salt solution showed that the coated titanium samples had better corrosion resistance than the polished one. The dissolution of silver nanoparticles resulted in a current peak in the polarization plots. In the antibacterial test against E. Coli, the inhibition zone width was 0.3, 1.6, 2.0 mm for the films with 0, 3.3, 9.1 at% Ag, respectively. The bactericidal mechanisms of the MgO and AgMgO films were discussed. The present work would provide a facile method for antibacterial surface modification of titanium based osteo-implants.
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Field of Study
Global Issues
Content Type
Periodical article
Date Published / Released
2016-05, 2016
Publisher
Trans Tech Publications
Topic / Theme
Engineering
Copyright Message
Copyright © 2016 Trans Tech Publications Ltd.
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